1.最簡單的方式-mysql（面向過程）

<?php $con = mysql_connect("localhost","root","password"); $select_db = mysql_select_db('test'); if (!$select_db) {die("could not connect to the db:\n" . mysql_error()); }//查詢代碼 $sql = "select * from db_table"; $res = mysql_query($sql); if (!$res) {die("could get the res:\n" . mysql_error()); } while ($row = mysql_fetch_assoc($res)) {print_r($row); } //查詢代碼//關(guān)閉數(shù)據(jù)庫連接 mysql_close($con); ?>

2.新的方式-mysqli（面向過程）

$mysql_server_name = 'localhost'; //改成自己的mysql數(shù)據(jù)庫服務(wù)器 $mysql_username = 'root'; //改成自己的mysql數(shù)據(jù)庫用戶名 $mysql_password = 'password'; //改成自己的mysql數(shù)據(jù)庫密碼 $mysql_database = 'test'; //改成自己的mysql數(shù)據(jù)庫名 $conn=mysqli_connect($mysql_server_name,$mysql_username,$mysql_password,$mysql_database); //連接數(shù)據(jù)庫 //連接數(shù)據(jù)庫錯(cuò)誤提示 if (mysqli_connect_errno($conn)) { die("連接 MySQL 失敗: " . mysqli_connect_error()); } mysqli_query($conn,"set names utf8"); //數(shù)據(jù)庫編碼格式// mysqli_set_charset($conn,"utf8");//設(shè)置默認(rèn)客戶端字符集。 // mysqli_select_db($conn,$mysql_database); //更改連接的默認(rèn)數(shù)據(jù)庫//查詢代碼 $sql = “select * from db_table”; $query = mysqli_query($conn,$sql); while($row = mysqli_fetch_array($query)){echo $row['title']; } //查詢代碼// 釋放結(jié)果集+關(guān)閉MySQL數(shù)據(jù)庫連接 mysqli_free_result($result); mysqli_close($conn);

3、常用方式-mysqli（面向?qū)ο?#xff09;

//連接數(shù)據(jù)庫方式1 $conn = new mysqli('localhost', 'root', 'password', 'test');//連接數(shù)據(jù)庫方式2 // $conn = new mysqli(); // $conn -> connect('localhost', 'root', 'password', 'test');//check connection (檢查PHP是否連接上MYSQL) if ($conn -> connect_errno) {printf("Connect failed: %s\n", $conn->connect_error);exit(); }//查詢代碼 $sql = “select * from db_table”; $query = $conn->query($sql); while($row = $query->fetch_array()){echo $row['title']; } //查詢代碼//釋放結(jié)果集+關(guān)閉MySQL連接 $query1 -> free_result(); $conn -> close();

4、PDO連接MySQL數(shù)據(jù)庫

<?php $db = new PDO('mysql:host=localhost;dbname=test', 'root', 'password'); try {foreach ($db->query('select * from db_table') as $row){print_r($row);}$db = null; //關(guān)閉數(shù)據(jù)庫 } catch (PDOException $e) {echo $e->getMessage(); } ?>

5、ADODB連接MySQL數(shù)據(jù)庫

<?php //安裝驅(qū)動(dòng)-引入類即可 require_once './adodb5/adodb.inc.php'; $conn = &ADONewConnection('mysql'); $conn->connect('localhost','root','password','test'); $conn->Execute("set names utf8"); //查詢代碼 $res = $conn->Execute("select * from db_table"); if (!$res){echo $conn->ErrorMsg(); }else{var_dump($res); } ?>//關(guān)閉連接 $conn->close();

6、總結(jié)-關(guān)閉mysql數(shù)據(jù)庫的連接方法

MySQL - 面向過程mysql_close($conn);MySQLi - 面向過程mysqli_close($conn);MySQLi - 面向?qū)ο?span id="ozvdkddzhkzd" class="hljs-variable">$conn->close();PDO$conn = null;ADODB$conn->close(); 或$conn->free(); 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎(jiǎng)勵(lì)來咯，堅(jiān)持創(chuàng)作打卡瓜分現(xiàn)金大獎(jiǎng)

總結(jié)

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